commonMain.adapters.ReadOnlyCollectionAdapters.kt Maven / Gradle / Ivy

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Kotlin Immutable Collections multiplatform library

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/*
 * Copyright 2016-2019 JetBrains s.r.o.
 * Use of this source code is governed by the Apache 2.0 License that can be found in the LICENSE.txt file.
 */

package kotlinx.collections.immutable.adapters

import kotlinx.collections.immutable.*


/*
 These classes allow to expose read-only collection as immutable, if it's actually immutable one
 Use with caution: wrapping mutable collection as immutable is a contract violation of the latter.
 */

public open class ImmutableCollectionAdapter(private val impl: Collection) : ImmutableCollection, Collection by impl {
    override fun equals(other: Any?): Boolean = impl.equals(other)
    override fun hashCode(): Int = impl.hashCode()
    override fun toString(): String = impl.toString()
}


public class ImmutableListAdapter(private val impl: List) : ImmutableList, List by impl {

    override fun subList(fromIndex: Int, toIndex: Int): ImmutableList = ImmutableListAdapter(impl.subList(fromIndex, toIndex))

    override fun equals(other: Any?): Boolean = impl.equals(other)
    override fun hashCode(): Int = impl.hashCode()
    override fun toString(): String = impl.toString()
}


public class ImmutableSetAdapter(impl: Set) : ImmutableSet, ImmutableCollectionAdapter(impl)


public class ImmutableMapAdapter(private val impl: Map) : ImmutableMap, Map by impl {
    // TODO: Lazy initialize these properties?
    override val keys: ImmutableSet = ImmutableSetAdapter(impl.keys)
    override val values: ImmutableCollection = ImmutableCollectionAdapter(impl.values)
    override val entries: ImmutableSet> = ImmutableSetAdapter(impl.entries)

    override fun equals(other: Any?): Boolean = impl.equals(other)
    override fun hashCode(): Int = impl.hashCode()
    override fun toString(): String = impl.toString()
}